Humidifiers have long been known to help combat the effects of dry air and relieve symptoms of allergies. When humidity levels are too low, your nasal passages can become irritated, which can further aggravate existing allergy symptoms. When humidity is too high, however, common allergens like dust mites, mold, and pollen can thrive and also make exacerbate symptoms. This is why well-balanced humidity levels are crucial for keeping allergies at bay.

If you suffer from allergies and are hoping to achieve an ideal humidity in your home, this article is for you: it compiles data on the leading humidifiers for allergy sufferers available in the market today.

  • Warm & cool mist, ultrasonic humidifier
  • Covers up to 650 sq. ft.
  • Tank can hold 2 gallons of water
  • Silver Clean Protection fights the growth of mold and mildew on the surface of the water tank
  • 12-hour timer
  • 3-year warranty

  • Coverage of 400 sq.ft
  • 2-Gallon Water Tank
  • 3 Output Levels
  • Cool Mist Evaporative Humidifier
  • 10-Year Warranty

  • Coverage of 500 sq.ft
  • UV Technology 99.9 Percent of Harmful Germs
  • 3 Output Levels
  • 1.1-Gallon Water Tank
  • 3-Year Warranty

    • Warm Mist Evaporative Humidifier
    • Coverage of 500 sq. ft
    • 95 Percent Bacteria-Free Steam
    • 1-Gallon Water Tank
    • 3-Year Warranty



    • Coverage of 210 sq.ft
    • 2 Output Levels
    • Cool Mist Ultrasonic Humidifier
    • 0.5-Gallon Water Tank
    • 1-Year Warranty



    • Warm and Cool Mist Option
    • Whisper Quiet
    • Output of 3.5 Gallons
    • Coverage of 650 sq.ft
    • 3-Year Warranty



    • Coverage of 753 sq.ft
    • Warm and Cool Mist Option
    • 1.5-Gallon water Tank
    • Auto Mode has Automatic Humidity Control
    • 1-Year Warranty



  • 1.6-Gallon Water Tank
  • Coverage of 400 sq.ft
  • 50 Hours Continuous Runtime
  • Auto Shut-Off
  • 2-Year Warranty


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AirCare MA0800 Digital Whole-House Humidifier

This AirCare model comes with an auto-humidistat and digital controls, and if you live in a large space, this thing has a coverage of up to 2600 sq.ft. It also has a 3-speed motor and a quiet nighttime setting, so it’s ideal for the bedroom or nursery.

The auto-humidistat shuts the unit down when the correct humidity levels get reached, and the auto shut-off is triggered when the 2.5-gallon water tank is empty.

Considering the massive coverage of this humidifier, you’d think that it would be expensive to buy, but it costs less than $100.

This unit sounds almost too good for the price, but beware; the filters are expensive to replace, and you’ll probably need to change them every 2 to 3 months, and that’s going to work out costly. And while it has a nighttime setting, this humidifier is nowhere near as quiet as others in its class. Even at the lowest fan setting, it will run at 50 dB!


  • Affordable
  • Extremely large coverage
  • Large water tank capacity
  • Auto-humidistat
  • Long runtime


  • Noisier than others in its class
  • Expensive replacement filters
  • Short life of the filters

The Venta LW25 Airwasher is a high-performance evaporative humidifier, capable of humidifying areas up to 400 sq. ft with its large 2-gallon tank. Air washers from Venta use a simple technique for humidifying and purifying the air at the same time. Dust, pollen, pet dander, and other airborne pollutants stick to rotating disks within the unit and become trapped in the water. The water adds moisture to the now purified air as it gets released in the form of mist via evaporation. You also have the option of adding essential oils to that mist for added relief from irritated sinuses and clogged nasal passages caused by allergic reactions.

Unfortunately, given the purchase price, the LW25 lacks key features and has a somewhat dated and bulky style. Despite these shortcomings, it’s undeniable that the LW25 is a powerhouse humidifier that has solidified its position as one of the best air washers in the market.


  • Large room coverage and large tank
  • No white dust
  • Compatible with Venta aromatherapy oils
  • No filters to replace
  • Quiet


  • Expensive
  • Fewer features
  • No humidistat/hygrometer
  • Somewhat dated and bulky exterior

The Honeywell HCM-350 has long been a favorite among humidifier buyers, and it’s easy to see why. The HCM-350 is a powerful evaporative humidifier, capable of servicing areas up to 500 sq. ft. in size with ease thanks to its 2.3-gallon daily humidity output.

It’s also capable of significantly reducing the number of air pollutants in the air; even it doesn’t claim to do so. Tests have shown that it can remove dust mites, pollen, dander, and other particles within a matter of minutes, making it an excellent choice for allergy sufferers. To further boost its allergen-busting capabilities, the HCM-350 also uses a patented UV technology that purportedly eliminates 99.9% of water-bred germs, bacteria, and mold spores, so you can be assured that its released mist is clean and germ-free.

Unfortunately, the biggest downside to the HCM-350 is its complete lack of features, like automatic shut off or a low water indicator. However, what it lacks in features, it makes up for in affordability, reliability, and durability.


  • Affordable
  • Quiet
  • Large room coverage
  • No white dust
  • Easy to maintain


  • No humidistat/hygrometer
  • No automatic shut off
  • No low water indicator
  • Need to replace wick filter regularly

With a 1-gallon tank capacity and a 1.9-gallon daily humidity output, the affordable V745 singlehandedly humidifies spaces as large as 500 sq. ft. What allergy sufferers would love about the V745 is that it comes with a cup for medicinal inhalants such as Vicks VapoSteam, which is great for relieving a stuffy nose and other flu symptoms. The warm mist further bolsters the V745’s ability to fight off allergies by soothing irritated nasal passages and preventing dust mites and mold spores from spreading.

One of the V745’s most critical drawbacks is the alarming number of complaints regarding leaking. Putting that flaw aside, the V745 remains an excellent choice for allergy sufferers looking for a warm mist humidifier to relieve common allergy symptoms.


  • Affordable
  • Large room coverage
  • High daily humidity output
  • No white dust
  • Medicine cup


  • No humidistat/hygrometer
  • No automatic shut off
  • No low water indicator
  • Leaking problems
  • Loud

The PureGuardian H940 is a compact humidifier that boasts an impressive 30-hour runtime between fill-ups despite having a 0.5-gallon water tank. Everything about the H940 is small: its size, its water tank, and its room coverage capacity.

The most desirable attribute of the H940 is the water tank’s Silver Clean Protection, a treatment used on the surface tank to prevent the growth of bacteria, mold, and mildew. While not specific to the H940, this feature ensures that you breathe clean mist that’s free from the allergy triggers of mold and mildew. Unfortunately, you use tap water in the H940, the machine releases white dust, which may trigger or aggravate allergies. To prevent this, you should use distilled or demineralized water.

Overall, the H940 is a great choice, especially for those on a tight budget. While it may not be the most powerful humidifier on this list, it nevertheless gets the job done at an affordable price.


  • Affordable
  • Small enough for travel
  • No filters to replace
  • Quiet
  • Long runtime


  • Releases white dust
  • Short warranty
  • Small water tank
  • Small room coverage
  • Not as durable as other models

This Boneco model has an output of 3.5 gallons over a 24-hours when placed in a room no larger than 650 sq.ft. It’s an ultrasonic humidifier, so it operates at less than 30 dB, meaning it’s whisper quiet, and it can also switch between warm or cool mist depending on your circumstances.

The water tank has a capacity of 1.75 gallons, and it has a long runtime, so leaving it on overnight is an option that makes this humidifier ideal for the bedroom. When you switch this Boneco 7135 into auto mode, it uses auto-mist technology which monitors the atmosphere and adjusts the mist output when the conditions change.

It also has a replaceable demineralization cartridge which eliminates any limescale or mineral residues. On the downside, the shape of the reservoir is so awkward that unless you have tiny hands, you are going to struggle to clean it. It’s also expensive compared to others featured in this review, and the demineralization cartridges are costly to replace.


  • Auto shut-off
  • Auto-mist technology
  • 3.5-gallon output
  • Quiet
  • Long runtime


  • Expensive to buy
  • Cartridges are expensive
  • Leaves white dust
  • Hard to clean
  • Not as durable as other models

If you’re looking for heavy duty humidification without the high price tag, then the Levoit LV600HH ultrasonic humidifier might be your cup of tea. The LV600HH is a robust and powerful humidifier capable of producing both warm and cool mist. While it doesn’t claim to remove any air pollutants, it can effectively lessen the concentration of dust mites and molds as it humidifies the air. It also boasts a compartment for essential oils which further boosts its ability to keep allergies at bay. Best of all, you can set it and forget it thanks to the automatic humidity control feature.

Unfortunately, the LV600HH requires substantial maintenance, with awkward places making it a chore to clean. Also, being an ultrasonic humidifier, the LV600HH also produces white dust. These flaws are easily overshadowed by the fact that the LV600HH is built to last and does its job exceptionally well.


  • Large room coverage
  • Quiet and durable
  • Automatic humidity control
  • Remote Control
  • Accurate humidity display


  • High maintenance
  • Difficult to clean
  • Difficult to fill
  • Releases white dust

This ultrasonic humidifier by Everlasting Comfort emits 270ml of moisture every hour, so reaching optimum humidity should be a breeze. The water tank holds 1.6 gallons, and it will run for 50-hours straight between refills. For the best results, make sure that you place this thing is an area no greater than 400 sq.ft.

It has a 360-degree nozzle to spread the moisture evenly and an auto shut-off feature when the reservoir runs dry. This humidifier also has an essential oils tray to leave your rooms fresh scented.

There is no need to shell out for filters on this model so it will save the pennies in the long run.

It has a 1.6-gallon water tank and is whisper quiet so night times will be restful and silent.

The downside is that you’ll be cleaning this thing frequently. The manufacturer recommends a clean once a week, but in reality, it’ll be more like every 5 days to avoid the smell of mildew.


  • Affordable
  • Small enough for travel
  • No filters to replace
  • Quiet
  • Long runtime


  • Needs cleaning frequently
  • Awkward to fill up
  • Not as durable as other models

Comparison Chart

FEATURESVenta Airwasher LW25Honeywell Germ-Free HCM-350Vicks Warm Mist Humidifier V745PureGuardian H940Boneco Warm and Cool Mist Humidifier 7135Levoit LV600HHUltrasonic Cool Mist HumidifierAirCare MA0800 Digital Whole-House Humidifier
Type of MistCoolCoolWarmCoolWarm and CoolWarm and CoolCoolCool
Type of HumidificationEvaporativeEvaporativeMistUltrasonicUltrasonicUltrasonicUltrasonicEvaporative
Room Coverage400 sq.ft700 sq.ft500 sq.ft650 sq.ft500 sq.ft400 sq.ft2600 sq.ft
Tank Capacity2-Gallon1-Gallon1-Gallon0.5-Gallon1.75-Gallon1.6-Gallon1.6-Gallon2.5-Gallon
ControlsManualManualManualManualDigitalDigital + Remote ControlManualDigital
Low Water IndicatorYesNoNoYesYesYesNoYes
Automatic Shut OffYesNoneYesYesNoYesYesYes
Weight8.5 lbs9 lbs4.25 lbs2.6 lbs8 lbs4.92 lbs4.15 lbs8.5 lbs
Dimensions11.8 x 13 x 11.817.5 x 9.4 x 11.812 x 7.9 x 14.27.3 x 7.3 x 15.415.2 x 8.8 x 15.411.3 x 7 x 10.514.3 x 7.5 x 12.512 x 18 x 16.5

Humidifier for Allergies Buyer’s Guide

Humidifiers and Allergies

Maintaining the right humidity levels at home is essential for the treatment of allergies. When the air is too dry, allergies like allergic rhinitis become aggravated because your nasal passages are irritated, which could lead to a sinus infection. Conversely, when the air is too humid, it creates the perfect environment for allergens such as mold, mildew, and dust mites to thrive.

Keeping the humidity between 30%-50% with the help of a humidifier can help clear your nasal passages and relieve any discomfort you may feel from allergic reactions. Having clear nasal passages helps rid your body of any allergens to which you might have been exposed. Having well-balanced humidity will ensure that mold and dust mites are minimized.

How Humidifiers Work to Limit Allergens

A good humidifier will significantly reduce the growth of allergens by creating an environment in which they are unable to thrive. As previously mentioned, common allergens like dust mites and mold can’t grow when humidity levels hit 30%-50%. By keeping the humidity at this level, humidifiers prevent these allergens from surviving in your home.

For the humidifier to remove allergens there needs to be mechanism that separates them from the air. Evaporative humidifiers that use a wick filter can do this as both the water and dry air pass through the filter before being released back into the room. Minerals and other pollutants are then trapped in the filter to allow clean, moisturized air to leave the humidifier.

An air washer is a type of humidifier that is also marketed as an air purifier because it can effectively lessen air pollutants in the vicinity. These air washers use an evaporative system but are usually more expensive than regular evaporative humidifiers. With these air washers, pollutants get trapped in evaporative mats or disks inside the humidifier.

The pros and cons of humidifiers for allergies:

  1. Substantial room coverage – Although this is generally desirable for a humidifier regardless of planned use, larger room coverage will ensure that larger areas of your house remain comfortable for you.
  2. Medicinal cup or compatibility with essential oils – You can add medicinal inhalants to medicinal cups built into humidifiers for added relief from cold, flu, and allergy symptoms. The same goes for humidifiers that are compatible with essential oils. Essential oils like lavender and peppermint can help alleviate allergic reactions.
  3. Easy to clean – This is an essential requirement if you’re planning to use a humidifier for your allergies. An awkwardly shaped humidifier will be challenging to clean and may leave places for mold, mildew, and bacteria to grow. When left unchecked, these microorganisms can be released into the air when you use your humidifier.
  4. With an antimicrobial feature – Although it isn’t required, having an antimicrobial feature on your humidifier can be beneficial to ensure that the growth of mold and bacteria is reduced.
  5. With a filter – If you want your humidifier to get rid of allergens, then you’ll want one that has a filter. A filter effectively removes air pollutants as well as prevent white dust from spreading.

The disadvantages of humidifiers for allergies

  1. Frequent cleaning – If you don’t maintain your humidifier you could be putting mold spores back into the atmosphere, and that defeats the object of owning a humidifier in the first place.
  2. Replacement filters – Remember to factor in the long-term running costs before you commit to buying a humidifier. Some replacement filters are expensive and have to be changed every 2-3 months.
  3. White Dust – In areas with high mineral content water expect an element of white dust residue on your surfaces. You can buy filters that reduce this but they are expensive.
Humidifiers for Allergies
  • Large room coverage
  • Medicinal cup/essential oils
  • Easy to clean
  • Antimicrobial features
  • Filters trap bacteria
  • Frequent cleaning
  • Replacement filter costs
  • White dust


What is white dust and how can you prevent it?

If the water you put into your humidifier has a high mineral content, you are going to suffer with white dust. When a humidifier uses tap or unfiltered water, the mist it produces often leaves dried mineral deposits or “white dust” on furniture and other surfaces. For most people, white dust isn’t a cause for concern, but it may be problematic for people who suffer from allergies, asthma, or other respiratory health conditions.

To prevent the spread of white dust, it’s best to use distilled or demineralized water for your humidifier. Unfortunately, this may add up to quite a hefty sum in the long run since distilled water is more expensive. Another option would be to purchase a demineralization cartridge for your humidifier which traps minerals before they become airborne. Otherwise, you can opt for an evaporative humidifier which has a wick filter that removes minerals from water before releasing it into the room.

How often should I clean my humidifier?

A humidifier could potentially be a double-edged sword when it comes to allergies. Due to the water it holds, a humidifier can be a breeding ground for dust mites, mold, and bacteria. When a humidifier is poorly maintained, these microorganisms are released into the room, doing more harm than good.

That’s why it’s important to stick to a strict cleaning schedule for your humidifier, and always read the instruction manual.

Manufacturers suggest thoroughly cleaning the humidifier once a week with white vinegar and bleach. The white vinegar is for descaling the humidifier and for removing any mineral deposits that might be stuck to the walls of the water tank and other parts of the humidifier. The bleach is for disinfection, making sure that the humidifier is free from any bacteria or mold. However, for safety purposes, it’s important to rinse the humidifier parts after bleaching so that you don’t end up inhaling any harmful chemicals.

Should I get a humidifier or an air purifier for allergies?

While humidifiers and air purifiers go hand in hand in improving overall air quality, their functions are different, and it would be impossible to expect one to be able to replace the other.

If you’re looking to remove pollutants like pollen, dust, smoke, volatile organic compounds, and odors, then you’re better off with a HEPA air purifier. A good HEPA air purifier will be able to lower the particle count in a room to zero in seconds. If air pollution isn’t too much of a problem and you’re just looking to make your home a little more comfortable, then a humidifier might be a better fit. If you’re looking for one device to both purify and humidify the air, though, then you might be interested to know about air purifier-humidifier combos. Read our review on the best air purifier-humidifier combos here.

What is an ideal tank capacity?

The ideal tank capacity will be different for each person and will depend on what you’re planning to use the humidifier for. If you’re planning to use it for traveling, then a smaller tank would be better. You might even consider a water-bottle humidifier.

However, generally speaking, a tank capacity of at least 1 gallon would be best. Humidifiers with a tank capacity of 1 gallon or more will be able to run for up to 30 hours before having to be refilled. Of course, this duration would depend on the model and brand of humidifier that you’re using, so it’s best to check these numbers first before making a purchase.

Final Thoughts

Whether you suffer or have a family member who suffers from allergies, introducing a humidifier into your home will bring benefits. And at night, when you could argue we are more susceptible to allergens, a humidifier could make the difference for a restful sleep.

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